Can you find out the missing number in the grid?

Replace the question mark with the number below given a simple math problem.

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Count the number of triangles in the below picture?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What is black when you buy it, red when you use it, and gray when you throw it away?